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Title: Residual Risk and Technology Review Amendments to the Secondary Aluminum Production National Emission Standards for Hazardous Air Pollutants (NESHAP)

Abstract: The existing National Emission Standards for Hazardous Air Pollutants (NESHAP) for Secondary Aluminum Production facilities (40 CFR part 63, subpart RRR) was promulgated in 2000 and regulate Hazardous Air Pollutants (HAP) from secondary aluminum production facilities that are major sources of HAP and that operate aluminum scrap shredders, thermal chip dryers, scrap dryers/delacquering kilns/decoating kilns, group 2 furnaces, sweat furnaces, dross-only furnaces, rotary dross coolers, and secondary aluminum processing units (SAPUs). The NESHAP also regulates area sources only with respect to emissions of dioxins/furans (D/F) from thermal chip dryers, scrap dryers/delacquering kilns/decoating kilns, sweat furnaces, and SAPUs. Section 112(f)(2) of the Clean Air Act (CAA) directs EPA to conduct risk assessments on each source category subject to maximum achievable control technology (MACT) standards and determine if additional standards are needed to reduce residual risks. The section 112(f)(2) residual risk review is to be done within 8 years after promulgation. Section 112(d)(6) of the CAA requires EPA to review and revise the MACT standards, as necessary, taking into account developments in practices, processes, and control technologies. The section 112(d)(6) technology review is to be done at least every 8 years. In this action, the EPA will conduct a risk assessment to determine if the NESHAP for secondary aluminum facilities should be strengthened. The EPA will also review technical progress in the source category to determine if newer, better technology for reducing emissions should be required of facilities in this source category. Additionally, in this action, the EPA plans to promulgate several technical clarifications to the NESHAP.